U.S. patent application number 13/881951 was filed with the patent office on 2013-10-17 for electric double-layer capacitor.
This patent application is currently assigned to KAWASAKI JUKOGYO KABUSHIKI KAISHA. The applicant listed for this patent is Tadashi Anada, Yukito Imamura, Masamichi Maruyama, Toru Morita, Noriaki Takakura, Masahiro Yamada. Invention is credited to Tadashi Anada, Yukito Imamura, Masamichi Maruyama, Toru Morita, Noriaki Takakura, Masahiro Yamada.
Application Number | 20130271893 13/881951 |
Document ID | / |
Family ID | 46050792 |
Filed Date | 2013-10-17 |
United States Patent
Application |
20130271893 |
Kind Code |
A1 |
Yamada; Masahiro ; et
al. |
October 17, 2013 |
ELECTRIC DOUBLE-LAYER CAPACITOR
Abstract
An electric double-layer capacitor, which provides enhanced heat
release-ability with a simple configuration ensuring vibration
resistance and impact resistance and to improve durability in a
severe marginal environment, is provided. The electric double-layer
capacitor includes capacitor cells; a pair of end plates,
respectively disposed on both sides of a plurality of parallelly
arranged capacitor cells; a metallic case for housing the end
plates, a plurality of capacitor cells; and an insulating resin,
filling the interior of the metallic case to cover the end plates,
a plurality of capacitor cells and lead terminals, wherein the
electric double-layer capacitor further includes an external
connecting terminal having two end sections, one of the end
sections being disposed in the end plate within the insulating
resin, and wherein the lead terminal of the capacitor cell disposed
adjacent to the end plate is configured to be connected to the one
of the end sections of the external connecting terminal.
Inventors: |
Yamada; Masahiro; (Kobe-shi,
JP) ; Imamura; Yukito; (Kobe-shi, JP) ;
Morita; Toru; (Kobe-shi, JP) ; Anada; Tadashi;
(Kobe-shi, JP) ; Maruyama; Masamichi;
(Nishinomiya-shi, JP) ; Takakura; Noriaki;
(Nishinomiya-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Yamada; Masahiro
Imamura; Yukito
Morita; Toru
Anada; Tadashi
Maruyama; Masamichi
Takakura; Noriaki |
Kobe-shi
Kobe-shi
Kobe-shi
Kobe-shi
Nishinomiya-shi
Nishinomiya-shi |
|
JP
JP
JP
JP
JP
JP |
|
|
Assignee: |
KAWASAKI JUKOGYO KABUSHIKI
KAISHA
Kobe-shi, Hyogo
JP
|
Family ID: |
46050792 |
Appl. No.: |
13/881951 |
Filed: |
October 25, 2011 |
PCT Filed: |
October 25, 2011 |
PCT NO: |
PCT/JP2011/074554 |
371 Date: |
June 25, 2013 |
Current U.S.
Class: |
361/502 |
Current CPC
Class: |
Y02T 10/7022 20130101;
H01G 11/78 20130101; Y02T 10/70 20130101; Y02E 60/13 20130101; H01G
11/74 20130101 |
Class at
Publication: |
361/502 |
International
Class: |
H01G 11/74 20060101
H01G011/74 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 8, 2010 |
JP |
2010-250124 |
Claims
1. An electric double-layer capacitor, comprising: capacitor cells,
in each of which a positive electrode and a negative electrode, and
a separator interposed therebetween, are housed in an exterior case
that is filled with an electrolytic solution, and lead terminals,
connected to the positive electrode and the negative electrode,
respectively, are drawn to the outside of the exterior case; a pair
of end plates, respectively disposed on both sides of a plurality
of parallelly arranged capacitor cells; a metallic case for housing
the end plates, and the plurality of capacitor cells; and an
insulating resin, filling the interior of the metallic case to
cover the end plates, the plurality of capacitor cells and the lead
terminals, wherein the electric double-layer capacitor further
comprises an external connecting terminal having two end sections,
one of the end sections being disposed in the end plate within the
insulating resin, and the other of the end sections protruding from
the insulating resin toward the outside thereof, and wherein the
lead terminal of the capacitor cell disposed adjacent to the end
plate is configured to be connected to the one of the end sections
of the external connecting terminal and be fixed to the end
plate.
2. The electric double-layer capacitor according to claim 1,
wherein the exterior case includes a discharge valve for
discharging a gas generated in the inside of the capacitor cell to
the outside thereof, and wherein the insulating resin fills the
interior of the metallic case so as to form a discharge path for
communicating the discharge valve to the outside thereof.
3. The electric double-layer capacitor according to claim 2,
wherein the discharge path is composed of a tubular member provided
so as to face the discharge valve.
4. The electric double-layer capacitor according to claim 1,
wherein a control board for controlling voltage of each of the
capacitor cells is provided above the insulating resin in the side
of an opening section of the metallic case.
5. The electric double-layer capacitor according to claim 1,
wherein a spacer being in contact with the inside of the metallic
case is provided.
Description
TECHNICAL FIELD
[0001] The present invention relates to an electric double-layer
capacitor having a capacitor cell, in which a positive electrode
and a negative electrode, and a separator interposed therebetween,
are housed in an exterior case together with an electrolytic
solution.
BACKGROUND ART
[0002] Conventionally, an electric double-layer capacitor is
employed as an electric capacitor with a large capacity and high
energy in electric power applications and the like. Many of the
electric double-layer capacitors include capacitor cells, in each
of which a positive electrode and a negative electrode, and a
separator interposed therebetween, are housed in an exterior case
(for example, aluminum laminate case or the like) together with an
electrolytic solution. The capacitor cell ordinarily has a
configuration, in which a positive electrode terminal and a
negative electrode terminal are drawn from a sealed section of the
exterior case. Since an output voltage of a single capacitor cell
itself is low that is around several volts (V), the capacitor cells
are typically utilized as a capacitor module, in which terminals of
a plurality of capacitor cells are connected according to a series
connection, a parallel connection, or a series-parallel connection
containing the series connection and the parallel connection
coexisting therein, in order to obtain a desired output performance
(for example, see Patent Literature 1).
CITATION LIST
Patent Literature
[0003] Patent Literature 1: Japanese Patent No. 3848190.
SUMMARY OF INVENTION
Technical Problem
[0004] Meanwhile, the electric double-layer capacitor is employed
in various applications, such as an application of electricity
storage for regenerating energy of electric motor vehicle and the
like, as this achieves a boosting charge with a large capacity, or
an application of compensation for power source, as this achieves a
momentary discharge, and thus durability for the use in more severe
peripheral environments such as, for example, environments
subjected to high ambient temperature, heavy vibration or heavy
impact, is required.
[0005] Thus, in the conventional technology, a heat sink plate may
be interposed between capacitor cells or a heat exchanger that
circulates a medium used as a cooling medium (liquid or gas) may be
disposed in the case where a plurality of capacitor cells are
arranged to be housed in the capacitor case, in order to prevent
deterioration by the heat of the capacitor cells. However, this
increases the size of the capacitor module since the parts for the
heat-releasing is disposed within the capacitor case, which
inevitably causes the decrease in the mechanical strength and the
increases in the installation space and the weight, and also, it is
not easy to inhibit vibrations or impacts exerted over the
capacitor cell through the module case, and further, it is
difficult to improve the durability of the capacitor cell.
[0006] While there is also a method for providing a heat transfer
frame in an outer circumference of an exterior case in each of
capacitor cells to ensure a heat-releasing effect of the capacitor
cell and a support strength of the cell as described in Patent
Literature 1, this method requires mounting heat transfer frames
for the respective cells so that the operation for assembling the
module becomes complicated, and in addition, this method provides
no countermeasure for the lead terminal of the capacitor cell
except for only supporting the exterior case of the capacitor cell,
and therefore vibration resistance and impact resistance for a
coupling section between the lead terminals or a coupling section
between the lead terminal and the external connection terminal
cannot be ensured.
[0007] Thus, an object of the present invention is to provide an
electric double-layer capacitor, which is capable of eliminating
the above-described defects to provide enhanced heat
release-ability with a simple configuration and to ensure vibration
resistance and impact resistance and to improve durability in a
severe marginal environment.
Solution to Problem
[0008] In order to solve the above-described problem, an electric
double-layer capacitor 1 of the present invention is configured to
comprise capacitor cells 10, in each of which a positive electrode
and a negative electrode, and a separator interposed therebetween,
are housed in an exterior case 11 that is filled with an
electrolytic solution, and lead terminals 12, 12 connected to the
positive electrode and the negative electrode, respectively, are
drawn to the outside of the exterior case 11; a pair of end plates
3, 3, respectively disposed on both sides of a plurality of
parallelly arranged capacitor cells 10; a metallic case 6 for
housing the end plates 3, 3 and a plurality of capacitor cells 10;
and an insulating resin 7, filling the interior of the metallic
case 6 to cover the end plates 3. 3, the plurality of capacitor
cells 10 and the lead terminals 12, wherein the electric
double-layer capacitor further comprises an external connecting
terminal 5 having two end sections, one of the end sections being
disposed in the end plate 3 within the insulating resin 7, and the
other of the end sections protruding from the insulating resin 7
toward the outside thereof, and wherein the lead terminal 12 of the
capacitor cell 10 disposed adjacent to the end plate 3 is
configured to be connected to the one of the end sections of the
external connecting terminal 5 and be fixed to the end plate 3.
[0009] Also, the exterior case 11 includes a discharge valve 13 for
discharging a gas generated in the inside of the capacitor cell 10
to the outside thereof, and wherein the insulating resin 7 fills
the inside of the metallic case 6 so as to form a discharge path 8
for communicating the discharge valve 13 to the outside
thereof.
[0010] Further, the discharge path 8 is composed of a tubular
member 20 provided so as to face the discharge valve 13.
[0011] Furthermore, a control board 21 for controlling voltage of
each of the capacitor cells 10 is provided above the insulating
resin 7 in the side of an opening section 6a of the metallic case
6.
[0012] Also, a spacer 9, which is in contact with the inside of the
metallic case 6, is provided.
Advantageous Effects of Invention
[0013] According to the electric double-layer capacitor of the
present invention, since the capacitor cells, the end plates and
one end section of the external connecting terminal housed in the
metallic case are covered with the insulating resin, that is, the
respective members housed in the metallic case are in the state of
being supported with the insulating resin, the capacitor cells, the
end plates, the external connecting terminals, the insulating
resin, and the metallic case exhibit substantially equivalent
behaviors when a vibration or an impact is exerted from the
outside, in other words, a state in which relative movements among
each of the members are substantially restricted is attained, and
therefore collisions among the members can be prevented. Also,
since the connecting section between the lead terminals and the
connecting section between the lead terminal and the external
connecting terminal are covered with the insulating resin, these
exhibit behaviors that are substantially equivalent to other
members, and therefore failures caused by the vibration and the
impact can be prevented. As described above, certain levels of the
vibration resistance and the impact resistance can be ensured with
a simple configuration for simply filling with the insulating
resin. Also, since heat generated from the capacitor cells is
transmitted to the surface of the insulating resin surface the
metallic case through the insulating resin to be released to the
outside, enhanced heat release-ability can be achieved.
[0014] Also, the discharge valve is provided and filling with the
insulating resin is carried out so as to form the discharge path
communicating the discharge valve to the outside, so that the
protection with the insulating resin can be achieved while
preventing the failure of the capacitor cell occurred by the
increased internal-pressure to ensure the vibration resistance and
the impact resistance.
[0015] Further, the discharge path is formed by employing the
tubular member to achieve easy operation for charging the
insulating resin.
[0016] Furthermore, since the control board is disposed above the
insulating resin, the members such as the capacitor cells and the
like exhibit substantially equivalent behaviors with the behavior
of the control board, so that it is difficult to exert a vibration
or an impact over the wires for connecting the capacitor cells to
the control board or the like to ensure the vibration resistance
and the impact resistance.
[0017] Also, since the spacer that is in contact with the inside of
the metallic case is provided, the insulating resin layer would be
firmly formed between the metallic case and the members such as the
capacitor cells and the like, and therefore the vibration
resistance, the impact resistance and the heat release-ability
achieved by the insulating resin are ensured. Also, since the
aligning of the capacitor cells in the metallic case is
facilitated, the assembly operation also becomes facilitated.
BRIEF DESCRIPTION OF DRAWINGS
[0018] [FIG. 1] FIG. 1 is a perspective view, showing a capacitor
cell of an electric double-layer capacitor according to an
embodiment of the present invention.
[0019] [FIG. 2] FIG. 2 is a perspective view, showing a capacitor
module and a metallic case.
[0020] [FIG. 3] FIG. 3 is a perspective view, showing an electric
double-layer capacitor.
[0021] [FIG. 4] FIG. 4 is a plan view of the electric double-layer
capacitor of FIG. 3.
[0022] [FIG. 5] FIG. 5 is a cross-sectional view of the electric
double-layer capacitor of FIG. 3.
[0023] [FIG. 6] FIG. 6 is a cross-sectional view of an electric
double-layer capacitor of a different embodiment.
DESCRIPTION OF EMBODIMENTS
[0024] An embodiment of the electric double-layer capacitor
according to the present invention will be described in detail on
the basis of the annexed figured. An electric double-layer
capacitor 1 of the present invention comprises a capacitor module 2
composed of a plurality of capacitor cells 10 shown in FIG. 1,
which are connected via the series connection, in order to obtain
the desired output. In addition to above, the capacitor module 2 is
not limited to the configuration for connecting a plurality of
capacitor cells 10 according to the series connection, and may
alternatively be formed according to the parallel connection, or a
series-parallel connection containing the series connection and the
parallel connection coexisting therein.
[0025] The capacitor cell 10 has the configuration, in which the
positive electrode and the negative electrode are housed in the
exterior case 11 in the state in which both electrodes are stacked
via the separator interposed therebetween, and the exterior case 11
is filled with an electrolytic solution, and further, lead
terminals 12 and 12, which are connected to the positive electrode
and the negative electrode, respectively, are drawn toward the
outside of the exterior case 11.
[0026] More specifically, each of the positive electrode and the
negative electrode is, for example, composed of a foil of a metal
such as aluminum and the like that is directly coated with
activated carbon, and for example, an alternate stack of different
electrodes is formed in the state in which a separator composed of
an insulator such as a resin and the like is interposed between the
electrodes, such that the positive electrode and the negative
electrode and the separator are integrally formed. Also, one end
sections of the strip-shaped lead terminals 12 and 12 for forming
connection to an electrical equipment are connected to the positive
electrode and the negative electrode, respectively, and the
respective other end sections of the lead terminals 12 and 12 are
drawn to the outside of the exterior case 11.
[0027] The exterior case 11 is made of a laminate aluminum foil
11a, which is formed of; for example, a metallic foil of aluminum
sandwiched between plastic films, and one of flat laminate aluminum
foils 11a is oriented so as to faces the other of the laminate
aluminum foils 11a having a recessed section (housing portion) 11b
formed in the substantially central portion thereof, which is
capable of housing the positive electrode, the negative electrode
and the separator, and the circumference sections of both the
laminate aluminum foils 11a and 11a surrounding the housing portion
11b are joined via a thermal fusion bonding and the like to seal
the interior space thereof. In addition to above, it is not limited
to employ the laminate aluminum foil 11a for the exterior case 11,
and various types of materials may alternatively be employed to
form the exterior case. Also, the laminate aluminum foil 11a may be
alternatively be formed by employing various types of joining
methods such as adhesion with an adhesive agent and the like, and
not limited to employing the thermal fusion bonding. Also, both of
the laminate aluminum foils 11a, 11a may be provided with the
housing portions 11b, respectively.
[0028] Also, a gas discharge valve 13 for discharging a
decomposition gas (for example, gases such as carbon monoxide,
carbon dioxide and the like), which is generated by the
electrolysis and the like of the electrolytic solution, is provided
above the housing portion 11b in the exterior case 11 to discharge
such a decomposition gas to the outside of the exterior case 11. In
addition to above, various types of known valves may be employed
for the gas discharge valve 13, as long as the valve serves as
preventing the increase in the internal pressure of the exterior
case 11.
[0029] A plurality of capacitor cells 10, each of which is formed
as shown in FIG. 1, are parallelly arranged as shown in FIG. 2, and
the positive electrode-side lead terminal 12 of one of the adjacent
capacitor cells 10 and 10 is connected to the negative
electrode-side lead terminal 12 of the other of the adjacent
capacitor cells to form the capacitor module 2 containing a
plurality of capacitor cells 10 connected according to the series
connection.
[0030] Also, as shown in FIG. 2, a pair of end plates 3, 3 are
disposed both sides of the capacitor module 2 in the condition of
contacting therewith, and for example, metallic bands 4, 4 are fit
onto the capacitor module 2 and the end plates 3, 3 to bind the
capacitor module 2 and a pair of end plates 3, 3 as an integral
body. In addition to above, the end plate 3 is composed of a plate
of an insulating resin such as, for example, an epoxy resin and the
like having larger size than the capacitor cell 10, but it is not
limited to the plate of the insulating resin such as an epoxy resin
and the like, and plates formed of various types of materials may
alternatively be employed. Also, while two bands 4 are fixed to be
vertically spaced apart from each other in FIG. 2, a single band or
three or more bands may alternatively be fixed.
[0031] Also, one end section of the external connecting terminal 5
is in contact with the upper end section 3a of the end plate 3, as
shown in FIG. 2. The external connecting terminal 5 includes a flat
connecting piece 5a formed in one end section thereof (bottom
end-side) for providing connection to the lead terminal 12 of the
capacitor cell 10. Also, two screw holes 5b, 5b are formed in the
connecting piece 5a. While the lead terminals 12 of the adjacent
capacitor cells 10 are inserted between the lower surface of the
connecting piece 5a and the upper end surface 3a of the end plate
3, screw or the like is screwed from the screw hole 5b of the
connecting piece 5a to the end plate 3 so that the lead terminal 12
is pinched between the connecting piece 5a and the upper end
surface 3a of the end plate 3, the external connecting terminal 5
is electrically connected to the lead terminal 12, and the lead
terminal 12 is fixed to the end plate 3. Also, the other end
section of the external connecting terminal 5 (upper end-side) is
formed to have the substantially cube shape so as to protrude
upward from the end plate 3, and the screw hole 5c for connecting
with external devices, parts, bus bars and the like is formed in
the upper surface side thereof.
[0032] The capacitor module 2, a pair of end plates 3, 3, the bands
4, 4, and the external connecting terminals 5, 5, which are
integrally formed, are housed in the metallic case 6 having the
opening section 6a on the upper side as shown in FIG. 2, and the
inside of the metallic case 6 is filled with the insulating resin 7
to form the electric double-layer capacitor 1.
[0033] More specifically, the insulating resin 7 is, for example, a
urethane resin, and is employed to fill the case so that the entire
capacitor cells 10 including the lead terminals 12 of the capacitor
cells 10, a pair of end plates 3, 3, the bands 4, 4, and the bottom
end-sides of the external connecting terminals 5, 5 are positioned
under an insulating resin surface 7a except the upper portion of
the gas discharge valve 13 of the capacitor cell 10, in other
words, so as to form the gas discharge path 8 communicating the gas
discharge valve 13 to the outside, as shown in FIG. 3 to FIG. 5.
Therefore, the connecting section between the lead terminals 12, of
the capacitor cells 10 and the connecting section between the lead
terminal 12 and the external connecting terminal 5 are in the state
to be covered with the insulating resin 7. While typical method for
forming the gas discharge path 8 includes a method for providing a
mold form so as to surround the gas discharge valve 13 before the
filling of the insulating resin 7 to prevent the inflow of the
insulating resin 7, other method may also be employed, and these
methods may be suitably changed.
[0034] Also, a spacer 9, which is in contact with the inside of the
metallic case 6, is provided before the insulating resin 7 is
filled in the metallic case 6. More specifically, the spacer 9 is,
for example, of a bar made of glass epoxy, and is disposed between
the end plate 3 and the metallic case 6 to form a space for forming
the insulating resin layer between the inside of metallic case 6
and the end plate 3 as shown in FIG. 5 and FIG. 6. In addition to
above, the spacer 9 may be previously fixed to the inside of the
metallic case 6, or may be previously fixed to the end plate 3, or
may be formed integrally with the end plate 3. More specifically,
the spacer 9 may be provided so that a certain space is provided
between the metallic case 6 and the member such as the capacitor
cell 10, the end plate 3 and the like without making a contact
between the metallic case 6 and the member to form the insulating
resin layer having a sufficient thickness that can ensure the
vibration resistance, the impact resistance and the heat
release-ability. Also, the shape of the spacer 9 is not limited to
the bar-shape, and suitable shape may be selected. Further, the
material thereof is not limited to glass epoxy, and suitable
material may be selected.
[0035] Since a plurality of capacitor cells 10, a pair of end
plates 3, 3, and the bottom end sections of the external connecting
terminals 5, 5 housed in the metallic case 6 are covered with the
insulating resin 7, in fact, are supported (fixed) by the
insulating resin 7 in the electric double-layer capacitor 1 having
the configuration, this can prevent these members from exhibiting
different behaviors thereby being mutually collided and so on.
Also, the connecting section between the lead terminals 12 of the
capacitor cells 10, and the connecting section between the lead
terminal 12 and the external connecting terminal 5 are fixed by the
insulating resin 7, so that failures caused by the vibration and
the impact can be prevented. Further, since the external connecting
terminal 5 is mounted to the end plate 3 fixed by the insulating
resin 7, influences due to the vibration and the impact can be
reduced, even if the upper end-side thereof protrudes from the
insulating resin 7. Also, since the insulating resin 7 functions as
a heat transfer material, and the case 6 is made of the metallic
material, this exhibits enhanced heat release-ability. Also, since
relatively flexible urethane resin is employed for the insulating
resin 7, this can follow the expansion and the shrinkage of the
capacitor cell 10, and this can also be employed up to around 80
degrees C., so that this can be resistant to the heat generated
from the capacitor cell 10 or the heat from the outside. Also,
since this exhibits an elastic property, the vibration and the
impact can be absorbed to provide improved vibration resistance and
improved impact resistance.
[0036] Also, since the gas discharge path 8 is provided, the
discharge of the gas can be smoothly conducted. Also, since the
spacer 9 is provided, the insulating resin layer can be firmly
formed between the metallic case 6 and the capacitor cell 10 or the
end plate 3 to ensure the vibration resistance, the impact
resistance and the heat release-ability and the alignment of the
capacitor cells 10 or the end plates 3 in the metallic case 6 can
be easily achieved, so that the assembly operation becomes
facilitated.
[0037] While the specific embodiment of the present invention has
been described above, the present invention is not limited to the
descriptions of the aforementioned embodiment, and various types of
modifications may be made thereto within the spirit and scope of
the present invention. For example, while the urethane resin is
employed for the insulating resin 7 in the above embodiment, this
is not limited to the urethane resin, and other types of resins
such as a silicon resin and the like or a rubber may alternatively
be employed. In such a case, improved heat release-ability and
improves impact absorbing-ability can be achieved by the
characteristics of the resin.
[0038] Also, a tubular member 20 may be disposed before filling the
insulating resin 7, in which, in the state in which one-side
(bottom end-side) of the tubular member is disposed to face the gas
discharge valve 13, the other-side (upper end-side) of the tubular
member is positioned to be at the same height to or to be higher
than the height of the insulating resin surface 7a as shown in FIG.
6, and thereafter the insulating resin 7 may be filled to form the
gas discharge path 8. In such a case, there is an advantage that
the operation for filling the insulating resin 7 is simplified. In
addition to above, this tubular member 20 may be pulled out from
the insulating resin 7 after the resin is cured.
[0039] Also, a control board 21 for controlling the voltage of the
respective capacitor cells 10 may be disposed in the side of the
opening section 6a of the metallic case 6 and on the insulating
resin surface 7a as shown in FIG. 6. In such a case, the control
board 21 is fixed by, for example, burying a leg section 21a of the
control board 21 in the insulating resin 7. As described above, the
control board 21 is fixed through the insulating resin 7, so that,
when a vibration or an impact is exerted from the outside, the
vibration or the impact is not directly reached to the control
board 21 but reached through the insulating resin 7 to cause the
behaviors that are substantially equivalent to the other members,
and therefore an advantageous effect of inhibiting the failure of
the control board 21 or the wire (not shown) for connecting the
control board 21 with the capacitor cell 10 or the like can be
achieved. In addition to above, it is not limited to employ the
insulating resin 7 for fixing the control board 21, the member
covered with the insulating resin 7 such as the end plate 3 and the
like may be employed.
REFERENCE SIGNS LIST
[0040] 1 electric double-layer capacitor [0041] 3 end plate [0042]
5 external connecting terminal [0043] 6 metallic case [0044] 7
insulating resin [0045] 7a insulating resin surface [0046] 8
discharge path [0047] 9 spacer [0048] 10 capacitor cell [0049] 11
exterior case [0050] 12 lead terminal [0051] 13 discharge valve
[0052] 20 tubular member [0053] 21 control board
* * * * *